/ Dictionary / Index P ptp.: Meaning and Definition of Find definitions for: ptp. Pronunciation: [key] past participle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ptosis pts. Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language